<mat-toolbar color="primary">
    <span class="fill-space"></span>
    <span>&copy;版权所有</span>
    <span class="fill-space"></span>
    <!-- <mat-toolbar-row>
        <span class="fill-space"></span>
        <span>友情链接第二行</span>
        <span class="fill-space"></span>
    </mat-toolbar-row> -->
</mat-toolbar>